[Guide] Service Mode and CSC Guide/Enable LTE/5G Bands and Services/5G Low Band on U1

mellojosh

Senior Member
Jun 12, 2010
173
28
0
Washington D.C.
Hello All,

Many people have asked about service mode and CSC related questions and I thought we should get a discussion going that is all in one place.

*DISCLAIMER* I do not take any responsibility for any issues that may occur from changing settings in these screens. They have the potential to cause service or data lost if used incorrectly. You have been warned!

Service Mode Guide

Access Service Mode

To access service mode screen, first download the Google Phone App from the Play Store (Phone by Google-Caller ID & Spam Protection is the official Play Store Name)

After installing the phone app, open it up and select set as default *Note* You will only need the Google phone app to access service mode-Once all the changes are made you can keep using it or change back to what you were using*

Another pop-up will show and select the Phone (blue icon) and set as default. Go to the dial pad icon in the bottom right corner and dial the following:

*#*#27663368378#*#*
When you dial the last * in the string above, the service mode menu will automatically show. YOU SHOULD NOT HAVE TO HIT THE CALL ICON BUTTON TO MAKE A CALL AT ANY POINT.
.

Congrats, you are now in the service mode menu!

Enable all LTE and 5G Bands
*NOTE* Remember whenever navigating through the menus that the android back button on your device will automatically exit you back to the dialer. To go back, you must use the 3 dots menu at the top and select Back.

To enable all the LTE Bands go to:
1-Option 2-UE Setting and Info
2-Option 1-Setting
3-Option 2-System
4-Option 9-Next Page
5-Option 9-Next Page
6-Option 9-Next Page
7-Option 9-Next Page
8-Option 1-Set LTE Band Config
9-Option 1-Set Default LTE Band

This should enable all the LTE Bands for the country that the firmware installed is from and the available roaming bands that are set in the firmware.

For the 5G Bands go back (using the 3 dots in the top) until you see UE setting menu and the 2 options for Protocol and System then:
1-Option 1-Protocol
2-Option 9-NR5G
4-Option 3-NR5G Prune Status
Here you will see a [1] Remove NR5G PRUNE option as the last line. Select that option. If you visit this menu later, it will show a * next to NR5G PRUNE is Removed and the option will change to [1] Restore NR5G PRUNE, in case you want to go back.

Enable DSS

Now that all the bands are enabled, you have to enable the DSS setting. Get back to UE SETTING MENU with Protocol and System options and:
1-Option 1-Protocol
2-Option 1-AS
3-Option 9-Next Page
4-Option 9-Next Page
5-Option 2-NR DSS CONTROL
6-Option 1-NR DSS ENABLE

Just reboot the phone after this and this should be all that is needed to enable all LTE and 5G Bands and DSS!

You can then go back into the Google dialer and dial *#*#2263#*#* and this screen will pop:


CSC Guide
CSC (which I think means Carrier Service Code) helps to set what options for settings show in the device for things like voicemail and wifi calling, as well as sets network code information for things like carrier aggregation combos.

When you go to your phone settings->about phone->software information and look in the Service Provider SW ver. section, you will see as the last line a combo like XXX/YYY/ZZZ. This indicates what carrier sales and network code is set and what brand the phone was manufactured as.

I think of the XXX/YYY/ZZZ configuration as follows
XXX=Sales Code-What kind of features are setup in the firmware like wifi calling, video calling and settings menus
YYY=Network Code-What kind of network features are set for things like carrier aggregation and LTE/5G bands
ZZZ=Manufactured as Code- What model the phone was originally manufactured as. Ot has no affect on the system settings or options. THIS CAN NOT CHANGE. IT SHOULD ALWAYS BE THE SAME. ONLY A ROOTED PHONE WOULD BE ABLE TO ACCESS THE FILES NECCESSARY TO CHANGE THIS.

For the Example of VZW/VZW/XAA, this would mean that the phone was sold as unlocked from Samsung and has a VZW SIM in it, setting the sales and network codes to VZW (XXX and YYY should usually be the same since you want the Network setup to match the settings setup in the phone, but they can be different, especially if you try to change the CSC in the U carrier branded firmware.)

Changing CSC
*NOTE*Changing the CSC does not necessarily need the Google phone dialer like for the service menu, however, if you are on a CSC where the stock dialer does not provide you with the CSC change screen (Like when your code is XAA/XAA/XAA) you can attempt it through there and see if you can access it. I haven't been able to test this yet, so let me know.

First, go to settings->about phone and at the top you will see your IMEI. Press and hold on the IMEI number and you will get a popup saying copied to clipboard. Then, go to the phone dialer and dial:
*#272*
After you see the numbers dialed at the top, press and hold after the last * and select paste then dial #. Again, you should never have to actually press the call button. A screen will auto pop. If it does not, try the Google dialer.


*Pro Tip*
Since some CSCs do not allow dialing the IMEI (like the XAA CSC) I recommend after you get to this screen to first select the recent menus button on your phone and click on the CSC app icon in the mini view. But beware, this is not working in the One UI 3 beta!!


Then click on Keep Open for Quick Launching


Then you will have a lock at the bottom of that apps recent screen to show it will stay in recent menu, even after reboot and selecting close all apps button


As you can see, mine is selected to VZW/VZW which is the XXX/YYY portion of the XXX/YYY/ZZZ combo (again, ZZZ should not change. Only having root can change this!)

You can now select a CSC and then click install at the bottom. This will reboot the phone and should not wipe any data.

*Pro Tip*
At the bottom of the CSC screen, there is an option that says Don't change carrier(for DEV/QA). Well, you know how when you change the SIM on the U1 firmware, the phone detects and new SIM and reboots to apply the new carrier settings? You can choose this and select install and get a popup showing ENABLED and the phone won't reboot, allowing you to choose the CSC and keep it with whatever SIM is installed.


Here is a list of the available CSCs on the U1 and the Carriers I have found:
ACG=NexTech/C-Spire
ATT=AT&T
AIO=Cricket
LRA=Bluegrass Cellular (possibly other smaller carriers also)
VZW=Verizon
BST=Boost Mobile
TMB=Tmobile
TMK=MetroPCS
TFN=Tracfone
USC=U.S. Cellular
XAA=Unlocked Non-Branded (Google FI is an example)
XAR=Cellular South
XAS=Samsung Unbranded Sprint
CCT=Xfinity Mobile
CHA=Spectrum (Charter)
XAG=Some MVNOs that use TMO, like Mint (confirmation needed)
ATC=Unknown
FKR=Unknown
GCF=Global Certification Forum
WWD=World Wide Device
SPR=Sprint
DSH=Dish Network

I hope everyone finds this guide helpful and I will add/change any information as it is discovered.
 
Last edited:

eric6268

Member
Mar 13, 2015
38
0
26
Hello All,



Many people have asked about service mode and CSC related questions and I thought we should get a discussion going that is all in one place.



*DISCLAIMER* I do not take any responsibility for any issues that may occur from changing settings in these screens. They have the potential to cause service or data lost if used incorrectly. You have been warned!



Service Mode Guide



Access Service Mode



To access service mode screen, first download the Google Phone App from the Play Store (Phone by Google-Caller ID & Spam Protection is the official Play Store Name)



After installing the phone app, open it up and select set as default *Note* You will only need the Google phone app to access service mode-Once all the changes are made you can keep using it or change back to what you were using*



Another pop-up will show and select the Phone (blue icon) and set as default. Go to the dial pad icon in the bottom right corner and dial the following:



*#*#27663368378#*#*

When you dial the last * in the string above, the service mode menu will automatically show. YOU SHOULD NOT HAVE TO HIT THE CALL ICON BUTTON TO MAKE A CALL AT ANY POINT.

.



Congrats, you are now in the service mode menu!



Enable all LTE and 5G Bands

*NOTE* Remember whenever navigating through the menus that the android back button on your device will automatically exit you back to the dialer. To go back, you must use the 3 dots menu at the top and select Back.



To enable all the LTE Bands go to:

1-Option 2-UE Setting and Info

2-Option 1-Setting

3-Option 2-System

4-Option 9-Next Page

5-Option 9-Next Page

6-Option 9-Next Page

7-Option 9-Next Page

8-Option 1-Set LTE Band Config

9-Option 1-Set Default LTE Band



This should enable all the LTE Bands for the country that the firmware installed is from and the available roaming bands that are set in the firmware.



For the 5G Bands go back (using the 3 dots in the top) until you see UE setting menu and the 2 options for Protocol and System then:

1-Option 1-Protocol

2-Option 9-NR5G

4-Option 3-NR5G Prune Status

Here you will see a [1] Remove NR5G PRUNE option as the last line. Select that option. If you visit this menu later, it will show a * next to NR5G PRUNE is Removed and the option will change to [1] Restore NR5G PRUNE, in case you want to go back.



Enable DSS



Now that all the bands are enabled, you have to enable the DSS setting. Get back to UE SETTING MENU with Protocol and System options and:

1-Option 1-Protocol

2-Option 1-AS

3-Option 9-Next Page

4-Option 9-Next Page

5-Option 2-NR DSS CONTROL

6-Option 1-NR DSS ENABLE



Just reboot the phone after this and this should be all that is needed to enable all LTE and 5G Bands and DSS!



You can then go back into the Google dialer and dial *#*#2263#*#* and this screen will pop:





CSC Guide

CSC (which I think means Carrier Service Code) helps to set what options for settings show in the device for things like voicemail and wifi calling, as well as sets network code information for things like carrier aggregation combos.



When you go to your phone settings->about phone->software information and look in the Service Provider SW ver. section, you will see as the last line a combo like XXX/YYY/ZZZ. This indicates what carrier sales and network code is set and what brand the phone was manufactured as.



I think of the XXX/YYY/ZZZ configuration as follows

XXX=Sales Code-What kind of features are setup in the firmware like wifi calling, video calling and settings menus

YYY=Network Code-What kind of network features are set for things like carrier aggregation and LTE/5G bands

ZZZ=Manufactured as Code- What model the phone was originally manufactured as. Ot has no affect on the system settings or options. THIS CAN NOT CHANGE. IT SHOULD ALWAYS BE THE SAME. ONLY A ROOTED PHONE WOULD BE ABLE TO ACCESS THE FILES NECCESSARY TO CHANGE THIS.



For the Example of VZW/VZW/XAA, this would mean that the phone was sold as unlocked from Samsung and has a VZW SIM in it, setting the sales and network codes to VZW (XXX and YYY should usually be the same since you want the Network setup to match the settings setup in the phone, but they can be different, especially if you try to change the CSC in the U carrier branded firmware.)



Changing CSC

*NOTE*Changing the CSC does not necessarily need the Google phone dialer like for the service menu, however, if you are on a CSC where the stock dialer does not provide you with the CSC change screen (Like when your code is XAA/XAA/XAA) you can attempt it through there and see if you can access it. I haven't been able to test this yet, so let me know.



First, go to settings->about phone and at the top you will see your IMEI. Press and hold on the IMEI number and you will get a popup saying copied to clipboard. Then, go to the phone dialer and dial:

*#272*

After you see the numbers dialed at the top, press and hold after the last * and select paste then dial #. Again, you should never have to actually press the call button. A screen will auto pop. If it does not, try the Google dialer.





*Pro Tip*

Since some CSCs do not allow dialing the IMEI (like the XAA CSC) I recommend after you get to this screen to first select the recent menus button on your phone and click on the CSC app icon in the mini view.





Then click on Keep Open for Quick Launching





Then you will have a lock at the bottom of that apps recent screen to show it will stay in recent menu, even after reboot and selecting close all apps button





As you can see, mine is selected to VZW/VZW which is the XXX/YYY portion of the XXX/YYY/ZZZ combo (again, ZZZ should not change. Only having root can change this!)



You can now select a CSC and then click install at the bottom. This will reboot the phone and should not wipe any data.



*Pro Tip*

At the bottom of the CSC screen, there is an option that says Don't change carrier(for DEV/QA). Well, you know how when you change the SIM on the U1 firmware, the phone detects and new SIM and reboots to apply the new carrier settings? You can choose this and select install and get a popup showing ENABLED and the phone won't reboot, allowing you to choose the CSC and keep it with whatever SIM is installed.





I hope everyone finds this guide helpful and I will add/change any information as it is discovered.
Thanks for sharing this. Very useful [emoji108] will try it after work. May we can enable eSim?

Sent from my SM-N986U1 using Tapatalk
 

mellojosh

Senior Member
Jun 12, 2010
173
28
0
Washington D.C.
Thanks for sharing this. Very useful [emoji108] will try it after work. May we can enable eSim?

Sent from my SM-N986U1 using Tapatalk
I originally started this looking to see if that was possible, but have not found anything in the service menu. I believe this has to be enabled in the csc .XML feature file located in the system folder of the phone, which requires root. If there was a way to edit the CSC file before flashing it in ODIN that might work, but I am not sure how to do that or if it is possible.
 

eric6268

Member
Mar 13, 2015
38
0
26
I originally started this looking to see if that was possible, but have not found anything in the service menu. I believe this has to be enabled in the csc .XML feature file located in the system folder of the phone, which requires root. If there was a way to edit the CSC file before flashing it in ODIN that might work, but I am not sure how to do that or if it is possible.
Have you been tried other CSC which supports eSim?

Sent from my SM-N986U1 using Tapatalk
 

mellojosh

Senior Member
Jun 12, 2010
173
28
0
Washington D.C.
Have you been tried other CSC which supports eSim?

Sent from my SM-N986U1 using Tapatalk
There are no North American CSCs that support eSIM that I have found. If you flashed a CSC from a country that does support it, like France, then you get into issues with messaging, wifi calling and LTE/5G bands and data not working correctly which is a bigger problem and kind of defeats the purpose of having service on the phone anyways.
 

maxpaynezm

Senior Member
Oct 30, 2012
592
208
73
google dialer change csc not work in Slovakia

edit
4-Option 9-Next Page - there is no next page

maybe is problem,this quide is for snapdragon? i have exynos
 
Last edited:

mellojosh

Senior Member
Jun 12, 2010
173
28
0
Washington D.C.
google dialer change csc not work in Slovakia

edit
4-Option 9-Next Page - there is no next page

maybe is problem,this quide is for snapdragon? i have exynos
I do not have access to exynos n20. Service mode menus could be different.

As for the dial codes, the format in the stock dialer is *#[insert code]# and the Google dialer format is *#*#[insert code]#*#* ....another CSC code used back on the S8 was *#243203855# from the stock dialer and also with the combination firmware flash method, which I haven't researched for the n20.

This guide is definitely more geared towards the note 20 U/U1 snapdragon but the codes may still get you additional options in other regions.
 

jeremyvbk

Member
Feb 10, 2014
43
10
28
Alright so I have done this on the ATT U version flashed to U1, and N12 doesn't end up appearing. Kinda weird. Also something weird is when you change the CSC and try to use ATT 5G it will not ever connect to 5G, just will show 5G indicator due to the upper layer Indicator. But I was able to enable N2,n5,n66 which ATT will end up using, and enabled DSS. Nothing changed and N5 is the only think available in my area as of yet. Do we know what DSS will look like if its being used? Will the *#0011# service mode show anything confirming DSS?

Also to note the DSH CSC has all NR bands unlocked from the get go.

Also I guess we can not enable SA on this yet. Would be cool to enable and test for active SA sites
 

freestylejunki32

Senior Member
Jan 26, 2012
350
68
0
Seattle
N20U u1 with cricket sim. Can’t get the CSC menu to pop up on stock or google dialer. Any suggestions? Trying to change csc to Att to enable WiFi calling
 
Last edited:

mellojosh

Senior Member
Jun 12, 2010
173
28
0
Washington D.C.
Alright so I have done this on the ATT U version flashed to U1, and N12 doesn't end up appearing. Kinda weird. Also something weird is when you change the CSC and try to use ATT 5G it will not ever connect to 5G, just will show 5G indicator due to the upper layer Indicator. But I was able to enable N2,n5,n66 which ATT will end up using, and enabled DSS. Nothing changed and N5 is the only think available in my area as of yet. Do we know what DSS will look like if its being used? Will the *#0011# service mode show anything confirming DSS?

Also to note the DSH CSC has all NR bands unlocked from the get go.

Also I guess we can not enable SA on this yet. Would be cool to enable and test for active SA sites
SA is now enabled in the One UI 3 Beta Firmware. See screenshot for updated bands!!!

As far as the n12 band, I believe ATT uses band 17 for 700mhz. Whenever I have band 12 I don't have 17 and when I have 17 I don't have 12, so I am guessing the ATT CSC disables it.

To see if low band 5G is in use, dial *#0011# in the stock dialer (or *#*#0011#*#* in the google one) and you will see a line for NR Band. If there is something there, its in use. If not and have the 5G icon, it is upper layer. Also, you can just open ookla speed test. If the bottom line says LTE and you have 5G signal bar, its upper layer.
 

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jeremyvbk

Member
Feb 10, 2014
43
10
28
Yeah I updated to the beta as soon as I did that post. N12 is what ATT used as it is a superset of Band 17 for years now. N12 is there if you flash the DSH csc though which was weird. Also the speed test method doesn't always work. It takes a bit to be accurate and with NSA on ATT and others it sometimes will still say LTE in speediest but be on 5G with an NSA connection
 

tribalfs

Senior Member
Mar 28, 2014
616
291
93
...
For the 5G Bands go back (using the 3 dots in the top) until you see UE setting menu and the 2 options for Protocol and System then:
1-Option 1-Protocol
2-Option 9-NR5G
4-Option 3-NR5G Prune Status
Here you will see a [1] Remove NR5G PRUNE option as the last line. Select that option. If you visit this menu later, it will show a * next to NR5G PRUNE is Removed and the option will change to [1] Restore NR5G PRUNE, in case you want to go back.
...
What does enabling or disabling NR5G PRUNE exactly do? Thanks.
 

tribalfs

Senior Member
Mar 28, 2014
616
291
93
If you enable the NR5G PRUNE, the phone will disable some NR 5G bands based on your CSC.
Disable the prune will enable all the nr bands on the modem.
Thanks. However, it makes no difference on the available 5G bands in the Band Selection menu of N9860 unit.
 

mellojosh

Senior Member
Jun 12, 2010
173
28
0
Washington D.C.
Hi,


Do you know how to reset all changes made in case of unexpected action somewhere?


Thanks
On the U1, you can insert a sim from another carrier and get the reboot pop-up and that resets nearly all service mode settings. On the U or U1, you can change the csc to another and then back, that resets most changed settings. You can also reboot into recovery and wipe or reset from the settings menu.
 

Romans8vs1

Senior Member
Sep 24, 2011
390
83
58
www.wedopayroll.com
On this step:
Enable DSS

Now that all the bands are enabled, you have to enable the DSS setting. Get back to UE SETTING MENU with Protocol and System options and:
1-Option 1-Protocol
2-Option 1-AS
3-Option 9-Next Page
4-Option 9-Next Page
5-Option 2-NR DSS CONTROL
6-Option 1-NR DSS ENABLE


I do not have the 6th step. It says "NR DSS No Support". I have a Sprint SM-N986U. I was able to do all of the other steps up until this point. Without this option (Enabling DSS), will I still notice any benefits?